Carlsen said in an interview that this move was kind of a bluff because he thought 35.Rf1 was holding for White. Which reminds me of a joke that can be adapted here: \"Do you know the only time Carlsen was wrong $2 When he thought he was wrong.\"
32. e2d3  32... e4f3 White's pieces are clumsy and Black has the h-pawn advancing, the idea of Bc5 attacking the queen, and a rook that can go to g2. 33. d1a1  33... a8c6  34. d3h7 